When VM=1, the protected-mode bit goes low and the Entry PLA selects real-mode entry points -- MOV ES, reg takes the one-line path. Meanwhile, CPL is hardwired to 3 whenever VM=1, so the V86 task always runs at the lowest privilege level, under full paging protection. The OS can use paging to virtualize the 8086's 1 MB address space, even simulating A20 address line wraparound by mapping pages to the same physical frames.
Starring: Yerin Ha, Luke Thompson, Adjoa Andoh, Lorraine Ashbourne, Nicola Coughlan, Ruth Gemmell, Claudia Jessie, Luke Newton, Golda Rosheuvel, and Emma Naomi
。同城约会对此有专业解读
1+# Important notice to residents of California and Colorado
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not inclined to install an S/370 in each branch, so it became a common pattern